<template>
  <div class="col-md-4">
    <form class="form-horizontal">
      <div class="form-group">
        <label>用户名</label>
        <input type="text" class="form-control" placeholder="用户名" v-model="name">
      </div>
      <div class="form-group">
        <label>评论内容</label>
        <textarea class="form-control" rows="6" placeholder="评论内容" v-model="content"></textarea>
      </div>
      <div class="form-group">
        <div class="col-sm-offset-2 col-sm-10">
          <button type="button" class="btn btn-default pull-right" @click="add">提交</button>
        </div>
      </div>
    </form>
  </div>
</template>

<script>
    export default {
      // props完整完整写法, 指定属性名，属性值类型，必要性
      props: {
        addComment: {
          type: Function,
          required: true
        }
      },
      data() {
        return {
          name: '',
          content: ''
        }
      },
      methods: {
        add() {
          // 1.检查输入的合法性
          const name = this.name.trim();
          const content = this.content.trim();
          if (!name || !content) {
            alert("name and comment不能为空！")
            return
          }
          // 2.输入有效的数据，封闭成一个comment对象
          const comment = {
            name, content
          }
          // 3.添加到comments中
          this.addComment(comment)
          // 4.清除输入
          this.name = ''
          this.content = ''
        }
      }
    }
</script>

<style scoped>

</style>
